Furnace-grate



UNi'rsn STATES PATENT OFFICE.

LAURENCE WILLIAM JERNBERG, OF WORCESTER, MASSACHUSETTS.

FURNACE-GRATEI.

I SPECIFICATION forming part of Letters Patent No. 469,816, dated March 1, 1892. Application filed August 14, 1891. Serial No 402,603 (No model.)

To aZZ whom, it may concern.-

Be it known that I, LAURENCE WILLIAM J ERNBERG, a citizen of the United States, residing at Worcester, in the county of WVorcester and State of Massachusetts, have invented a new and useful Furnace-Grate, of which the following, together with the accompanying drawings, is a specification sufficiently full, clear, and exact to enable persons skilled in the art to which this invention appertains to make and use the same.

This invention relates to improvements in that class of furnace-grates wherein a series of independent bars are separately supported on struts or tilting chairs, thereby aifording facility for easy endwise movement of the bar.

The objects of my invention are, first, to provide improved means for effecting the shaking action of the grate, adapted for large or small grates and whereby large and heavy furnace-grates can be operated with ease and facility; second, to provide a peculiar construction of stilt-bar or tilting chair which will afford support for the bars against lateral displacement; third, to provide, in combination with the ends of the bars, a system of peculiarly-arranged finger-plates or end guards that can be individually readily removed to facilitate the removal of any grate-bar fourth, to provide a grate-bar which works in connection with the end guard by a lifting and endwise action, and having down wardlycurved ends to prevent the blocking of the grate-bars by clinkers or pieces of coal. These objects I attain by the mechanism herein shown and described, the particular subjectmatter claimed being hereinafter definitely specified. V

In the drawings, Figure 1 is a vertical longitudinal section through my improved grate at line 00 00. Fig. 2 is a plan view showing onehalf of the grate-bars in position, the other half omitted, the better to illustrate the parts beneath. Fig. 3 is a sectional elevation view showing in detail the shaking devices. Fig.

4 is a vertical transverse sectional view showing the arrangement of the tilting chairs. Fig. 5 is a plan view of the front bed-beam or supporting-girt, showing two of the shaker-levers. Fig. 6 is a plan view of one end of the gratebar. Fig.7 shows the detail of the end guard or finger-plate in end view, section, and plan. Fig. 8 shows the front of the grate-bar supporter or tilting chair. Fig. 9 is a diagram illustrating the movement of the grate-bar, and Fig. 10 shows a modification.

My improved grate is especially adapted for steam-boiler furnaces of the kind generally employed for stationary boilers and steam-producing plant and can be put in as a part of the original structure or introduced into furnaces to replace grates previously employed therein; also, for other kinds of furnaces wherein a grate of similar nature can be employed.

Referring to parts, A A denote the bedbeams or girts upon which the gate-bars B are supported by means of the stilts or tilting chairs 0. Said beams are supported upon suitable side frames D, or in some instances, as where furnace-walls are formed of brick, they can be extended into and supported by the brick-work at the sides of the ash-pit. The bed-beams are formed of two longitudinal vertical plates or webs connected together by a series of transverse plates or bars a, havingangular-shaped depressions in their upper edges, and upon which the tilting chairs 0 are seated. Theforwardbed-beamis provided with a series of lugs or brackets a, that project forward and are fitted With vertical openings in which are pivotally supported the horizontally-oscillative compound bell-crank levers or shakers E, each of which is provided with a downwardly-projecting pivot for fitting into the opening in the lug a, and with two upright studs or wrist-pins e, that respectively engage transverse slots in the under side of the grate-bars. Each shaker connects with two adjacent grate-bars in such manner that one bar is drawn forward while the other is moved back, and vice versa, as the shaker or bell-crank lever is oscillated.

An arm E, projecting from the side of the shaker E, is connected bya rod G with a handlever G at the exterior of the furnace wall, by means of which lever the operation of the grate can be effected. The movement of the shakers E in one direction is indicated by dotted lines in Fig. 5, and they swing to the same extent in the opposite direction. Said lever G is herein shown as fulcrumed on a stud g on the furnace-front, to be worked by backward and forward swinging of the upper end of said handle-lever. i

The shakers or compound bell-crank levers E can be worked singly, if desired, but are best coupled in pairs or in greater numbered series by means of arms e and link-rods f, so that the grate-bar surface can be operated in sections of two, four, six, or more bars with one handle lever or operator.

The operator or lever G can be placed at any convenient position, either at the front or side of the boiler-frameor brick-work; or, if desired, in some instances connection can" be made with the parts E through the ashpit door by an arm: or conneeting socket, as indicated bydotted lines at E, Fig. 5.

Atthe ends of the grate-bars B, I provide peculiar stationary guards or finger plates I,- formed substantially as indicated in Figs: 1, 2, and 7, and made in width to correspond with the'widthof the grate-bars. Said guards are supported onauxilary bars or bearers H, extending laterally across the space at the front and 'rear ofthe furnace. Said guardplates 1 are transversely grooved onltheir un-- der side to fit onto their bearers H, and are furnished with a series offingers 2', arranged to correspond with and lap overthefingers 11, formed ontheendof the grate-barsi (See Figs. 2, 6, and 7.) The endsofi the grate-bars are made with a downward curve, asat F, ap'- proximately corresponding to the l'i'neof move ment or the grate action, and: the under part oftheguard-fingers are curvedupward or inclined to match thesamet This'cu rved form: atthe ends orthe bars is designed to prevent clink'ersand pieces ofi coal from entering between: the adjacent surfaces of the grate and:

guard fingers and there: wedging or interfer ing: with the free action of themechanisnn By constructing the end guards: or finger-- plates I in sections thatcorrespond in width" tothe Width: of the grate-bar any guard-sew tion -canbe individually removed bysimply lifting it from the bearer-bar H, thus giving access to any one of the several grate-bars, which: cam then-be readily and singlyre'movett and: replaced, as desired. This finger ptate or removable endguard-section is an i-mpor taut feature ofmy invention.

J indicates the: hearth-plate at the door ot the furnace, and K the furnace-front, which he of any oi the usual welhknown kinds emplbyed inboiler furnaces or'stmilarfurnace constructions.

The tilting chairs or struts 6, by which the giate bars are sustained, are made, as shown, witir two: top bearing surfacesc a, (see Fig. 8,) that engage with recessedllugsn at on the interior" or between" the Web-flanges of the grate bars B, and with two bottom bearing-- surfaces 0 a that rest upon the separate crofss bars a of the bedbeam A. The disposition of these four bearing-points givesgreat lateral width to the chair C,-so that the grate bar is strongly supported against lateral and vice versa, effecting an up-and-down action in connect-ion with-theendwisemovementwhen the grate-bars are moved eitherway' from their central positiom-thus giving two distinct movements-viz,-horizontal and are about three-fourths of an inch below the level, I

(see full lines and dotted 1i'nes, Fig.- 9,)'-and therebycausing the fire-bed tobe moved bod ily and thoroughly shaken.

If in any instance it isdesired that the grate-bars should have a straight horizontal movement, the chairs or'stru'tscan beformed, as in Fig. 10, to have a segment of a circle at their upper ends, with three or more lu'gs or teeth thereon to engage with a straight rack on the grate-bar, all 'otherparts ofi the mechanism being and operating substantiallyas above described.

I am aware that furnace gr'ate bars have heretofore been arranged in different manner en'dwise action of the individual bars; and do not therefore broadly claim su'cltfeature irrespective of the particular construction 06 mechanism as of myinventiont I claim-- 1 The combination; with the bedbeams and longitudinally-movablegratebars, of the tilting chairs sustaining said grate-bars at or near their respective ends disposed at opposite inclinations, so as to= alternatelyswiu g to a vertical position, the compound belt-crank levers pivotedin brackets-on the forward bedjcbeam and having forwardly-projectingWrist ,pins that engage with transverseslots-in the i gratebars in a manner to permit up-and-dowir movement simultaneous with their endwise t action,a connection'extending to the exterior io'fi the furnace,- anda hand l'ever attached to 5 said connection for working the bell-crankle vers, substantially as set fortlr.

2. The combination, substantially as dej scribed, of the two bed beams'm-the' fro'n'tone' providedwith theprojecting brackets or lugs iaflthe compound bell-crank levers E, having idownwardly-projecting pivots supported in j openings in said brackets; upwardly-projectiing wrist-pins e integral therewith, and operating-arms e, the gratebars Bghaving transjverse slots that engage said" wrist pins', the 2 oppositely inclined tilting chair 0, seated on jsaid bed-beam and individually sustaining the respective ends of said grate-bars, the operating-links f, connecting the arms 6', the

to have tilting supporters and independent connecting-link G for nioving said bell-crank lever, and the handle-lever G at the exterior of the furnace, all substantially as and for the purposes set forth.

3. In a furnace-grate, the end guard I of the peculiar construction shown, comprising the series of fingers 2', substantially horizontal on top and forwardly tapered below, the several fingers laterally connected to each other by a transverse undergrooved body, and the transverse auxiliary bearer-beam disposed across the furnace at the ends of the grate, whereon said end guards are sustained by the lip of the body-groove, in combination with the endwise-movable grate-bars having correspondingly-disposed fingers that extend beneath the respective guard-fingers in the same upright planes therewith, all substantially as shown and described.

4. The end guard-plates formed in sections corresponding in width to the width of the individual grate-bars, and the auxiliary transverse bearer-beams whereon said guard-plates are relnovably supported, disposed across the furnace beyond the ends of the grate-bar, in combination with the endwise-movable gratebars having fingered ends that extend beneath said guard-plates, substantially as set forth.

5. The tilting chair 0, when constructed as hereinbefore described, with two upper bearing-surfaces c and c and the lower bearingsurfaces 0 and 0?, and the downwardly-extending lugs X, in combination with the bedbeam having the cross-bars a, recessed to receive said lower bearing-surfaces, and the grate-bars having recessed bearing-lugs n, adapted to receive said upper bearing-surfaces, all substantially as shown and described.

6. The combination, as described, of the grate-bars having the ends thereof constructed with a series of longitudinal fingers 1), formed with a downward curve on their upper surface, as at F, the end guard-plates having a series of overlying fingers 1', disposed in the same upright planes with said grate-bar fingers and undercurved beneath along their overlying ends to match said curve F, the oppositely-inclined tilting chairs supporting said grate-bars and adapted to swing to vertical positions at one limit of their action, and I LAURENC E WILLIAM JERNBERG.

Witnesses:

CHAS. H. BURLEIGH, ELLA P. BLENUS. 

